In a small bowl, combine the cream cheese and sriracha until completely blended.
Spread two slices of bread with the sriracha cream cheese. Top with turkey and kimchi, then cover with remaining bread.
Melt the butter or margarine in a grill pan over medium-high heat. Add the sandwiches and cook 3-4 minutes on each side, or until the bread is toasted and the fillings are warm.
Serve immediately or let cool to room temperature.